Adafruit.io无法识别连接状态

Question

“我正在python中使用Adafruit.io，我想在断开连接时收到通知吗？

我尝试使用多线程以便在断开连接时发出通知

def connected(client):

global loop_flag
loop_flag=0

# Connected function will be called when the client is connected to Adafruit IO.
# This is a good place to subscribe to feed changes.  The client parameter
# passed to this function is the Adafruit IO MQTT client so you can make
# calls against it easily.
print('Connected to Adafruit IO!  Listening for {0} changes...'.format(FEED_ID))


def checking():

global counter
while loop_flag==1:

    print("Waiting for a call back{}".format(counter))
    time.sleep(1)
    counter=counter+1
    if counter==5:
        #client.disconnect()
        print('disconnected from the service')
        sys.exit(1)
t1=threading.Thread(target=connected(client))
t2=threading.Thread(target=checking)

t2.start()
t1.join()
t2.join()
client.loop_blocking()

如果没有连接esp，则表明没有连接，但是如果连接了一次，并且连接中断，则操作将永远循环，这是因为client.loop_blocking（），但是我无法对此发表评论标头解析数据